The cover art is attributed to an article entitled “Measurement methods on electrodes and electrocatalysts for water electrolysis” by Professor Shigenori Mitsushima et al. Editor’s Choice of this issue is an invited review article of comprehensive work on measurement methods for water electrolysis, transcribed from the article published in Denki Kagaku in 2022 (DOI: 10.5796/denkikagaku.22-TE0003) as a guidance for researchers. Development of highly efficient methodology of water electrolysis by renewable energy is highly demanded to realize carbon-neutral society with sustainable growth. However, absence of rigorous evaluation protocol for the performance of water electrolysis may hinder the sound progress of relevant research fields. The authors introduced common measurement techniques of two representative water electrolysis, alkaline water electrolysis (AWE) and proton exchange membrane water electrolysis (PEMWE). This work will help researchers to avoid making unfair comparison and prevent misjudgment of the experimental results obtained in different institutes, that is ultimately beneficial to the community.
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